Re: Sims 3 launcher won't open
@Kiarah001 Please undo any changes you've made (i.e. compressing files). Try reinstalling DirectX 9. You don't need to uninstall anything; just download the installer from Microsoft and run it.
https://www.microsoft.com/en-US/download/details.aspx?id=8109
Restart your computer afterwards and before trying to play.
If that doesn't help, please run a dxdiag and attach it to a post.
https://help.ea.com/en/help/pc/how-to-gather-dxdiag-information/
Edit: For anyone struggling to install DX9 or unsure if the runtime has in fact installed, please see this post for more detailed instructions: